You’ll also need to fill out a medical questionnaire with answers about your medical history, current medications, and lifestyle habits. Here are some key factors to consider when deciding: Pricing: Know how much your monthly supply will cost with shipping and tax. The generic versions are just as effective and much less expensive. These PDE5 inhibitors may cause headache, flushing, drop in blood pressure, or other adverse effects. The specific process for getting ED pills online depends on your chosen provider.According to price-comparison site test1.ru, generic Revatio will cost you as little as $ per pill, depending on where you fill your prescription. That’s compared with . Vision changes. Muscle pain. But there are some differences. With Viagra, there is a higher risk of vision changes than with Cialis. Among people who take Viagra or sildenafil, 3% . $12 View other PDE5 Inhibitors Sildenafil (Viagra, Revatio) is a moderately priced drug used to treat erection problems in men. It is also used to treat pulmonary arterial .